A market research firm is conducting a study to determine which of two package designs for a liquid soap product potential customers prefer, the current design (A) or a new design (B). A sample of 20 potential customers is taken. The results follow. 
Use Excel to conduct the appropriate hypothesis test at = .05 to determine if the data indicate that there is a difference in preference between the two designs.
Definitions:
Macrophages
Immune cells that engulf and digest cellular debris, foreign substances, microbes, and cancer cells.
Phagocytosis
Phagocytosis is a cell's process of engulfing and digesting solid particles, such as bacteria, as a defense mechanism or for nutrient acquisition.
Protein Fibers
Long, filamentous proteins such as collagen or keratin that provide structural support and strength to cells and tissues.
Connective Tissue
Tissue that supports, connects, or separates different types of tissues and organs in the body, characterized by few cells and various fibers embedded in a large amount of extracellular matrix.
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